// Copyright (c) 2000-2004 Brian Wellington (bwelling@xbill.org)

package org.xbill.DNS;

import java.io.IOException;

/**
 * Name Authority Pointer Record - specifies rewrite rule, that when applied to an existing string
 * will produce a new domain.
 *
 * @author Chuck Santos
 * @see <a href="https://tools.ietf.org/html/rfc3403">RFC 3403: Dynamic Delegation Discovery System
 *     (DDDS) Part Three: The Domain Name System (DNS) Database</a>
 */
public class NAPTRRecord extends Record {
  private int order, preference;
  private byte[] flags, service, regexp;
  private Name replacement;

  NAPTRRecord() {}

  /**
   * Creates an NAPTR Record from the given data
   *
   * @param order The order of this NAPTR. Records with lower order are preferred.
   * @param preference The preference, used to select between records at the same order.
   * @param flags The control aspects of the NAPTRRecord.
   * @param service The service or protocol available down the rewrite path.
   * @param regexp The regular/substitution expression.
   * @param replacement The domain-name to query for the next DNS resource record, depending on the
   *     value of the flags field.
   * @throws IllegalArgumentException One of the strings has invalid escapes
   */
  public NAPTRRecord(
      Name name,
      int dclass,
      long ttl,
      int order,
      int preference,
      String flags,
      String service,
      String regexp,
      Name replacement) {
    super(name, Type.NAPTR, dclass, ttl);
    this.order = checkU16("order", order);
    this.preference = checkU16("preference", preference);
    try {
      this.flags = byteArrayFromString(flags);
      this.service = byteArrayFromString(service);
      this.regexp = byteArrayFromString(regexp);
    } catch (TextParseException e) {
      throw new IllegalArgumentException(e.getMessage());
    }
    this.replacement = checkName("replacement", replacement);
  }

  @Override
  protected void rrFromWire(DNSInput in) throws IOException {
    order = in.readU16();
    preference = in.readU16();
    flags = in.readCountedString();
    service = in.readCountedString();
    regexp = in.readCountedString();
    replacement = new Name(in);
  }

  @Override
  protected void rdataFromString(Tokenizer st, Name origin) throws IOException {
    order = st.getUInt16();
    preference = st.getUInt16();
    try {
      flags = byteArrayFromString(st.getString());
      service = byteArrayFromString(st.getString());
      regexp = byteArrayFromString(st.getString());
    } catch (TextParseException e) {
      throw st.exception(e.getMessage());
    }
    replacement = st.getName(origin);
  }

  /** Converts rdata to a String */
  @Override
  protected String rrToString() {
    StringBuilder sb = new StringBuilder();
    sb.append(order);
    sb.append(" ");
    sb.append(preference);
    sb.append(" ");
    sb.append(byteArrayToString(flags, true));
    sb.append(" ");
    sb.append(byteArrayToString(service, true));
    sb.append(" ");
    sb.append(byteArrayToString(regexp, true));
    sb.append(" ");
    sb.append(replacement);
    return sb.toString();
  }

  /** Returns the order */
  public int getOrder() {
    return order;
  }

  /** Returns the preference */
  public int getPreference() {
    return preference;
  }

  /** Returns flags */
  public String getFlags() {
    return byteArrayToString(flags, false);
  }

  /** Returns service */
  public String getService() {
    return byteArrayToString(service, false);
  }

  /** Returns regexp */
  public String getRegexp() {
    return byteArrayToString(regexp, false);
  }

  /** Returns the replacement domain-name */
  public Name getReplacement() {
    return replacement;
  }

  @Override
  protected void rrToWire(DNSOutput out, Compression c, boolean canonical) {
    out.writeU16(order);
    out.writeU16(preference);
    out.writeCountedString(flags);
    out.writeCountedString(service);
    out.writeCountedString(regexp);
    replacement.toWire(out, null, canonical);
  }

  @Override
  public Name getAdditionalName() {
    return replacement;
  }
}
